Determination of undoped CdTe(111) surface polarity by surface photovoltage spectroscopy

L. Burstein, Yoram Shapira, E. Moons, David Cahen

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Abstract

Surface photovoltage spectroscopy has been used as a clear, simple method to identify the two polar faces [(111) and (111)] of undoped CdTe. The difference in electronic structure of the two faces is clearly observed in air on polished untreated samples. The (111)Te surface is characterized by an acceptor level, at an energy 1.17 eV below the conduction-band minimum, which is assumed to result from TeO2-CdTe interaction. The (111)Cd surface is distinguished by two additional donor levels, at 1.11 and 1.33 eV above the valence-band maximum, which seem to be due to Cd surface atom displacements, accompanying the Te oxidation. These assignments are supported by the results obtained after various chemical treatments.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalApplied Surface Science
Volume74
Issue number2
DOIs
StatePublished - Feb 1994
Externally publishedYes

Funding

In Rehovot this work was supportedi n part by a grant from the Israel National Council for R&D and the KFA Julich (Germany).O ne of us (L.B.) wishes to thank the Eshkol Foundation and the Pikovsky-Valazzi Foundation for the post-doctorals cholarships upport in carryingo ut this research.

FundersFunder number
Israel National Council for R&D

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